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Simplifying -10r + -21 = -81 Reorder the terms: -21 + -10r = -81 Solving -21 + -10r = -81 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -10r = -81 + 21 Combine like terms: -21 + 21 = 0 0 + -10r = -81 + 21 -10r = -81 + 21 Combine like terms: -81 + 21 = -60 -10r = -60 Divide each side by '-10'. r = 6 Simplifying r = 6
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